js Simple Realization Method of Adjusting Web Page Font Size

In this paper, an example is given to describe the simple method of adjusting the font size of web pages by js. Share it for your reference, as follows:

//var tgs = new Array('div','td','tr');
var tgs = new Array('td','tr');
//Specify spectrum of different font sizes:
//var szs = new Array( 'xx-small','x-small','small','medium','large','x-large','xx-large' );
var szs = new Array( '10px','12px','14px','16px','18px','20px','22px' );
var startSz = 2;
function tsize( trgt,inc ) {
  if (!document.getElementById)
  {
    return
  }
  var d = document,cEl = null,sz = startSz,i,j,cTags;
  //sz += inc;
  sz = inc;
  if ( sz < 0 )
  {
    sz = 0;
  }
  if ( sz > 6 )
  {
    sz = 6;
  }
  startSz = sz;
  if ( !( cEl = d.getElementById( trgt ) ) ) cEl = d.getElementsByTagName( trgt )[ 0 ];
  cEl.style.fontSize = szs[ sz ];
  for ( i = 0 ; i < tgs.length ; i++ )
  {
    cTags = cEl.getElementsByTagName( tgs[ i ] );
    for ( j = 0 ; j < cTags.length ; j++ )
    {
      cTags[ j ].style.fontSize = szs[ sz ];
    }
  }
}

Usage:

<td width="13">
<a href="javascript:tsize('body',0)">
<img src="../image/fsize1of.gif"
name="fsize1" width="18" height="14" border="0" id="fsize1"
onMouseOver="MM_swapImage('fsize1','','../image/fsize1on.gif',1)"
onMouseOut="MM_swapImgRestore()"></a>
</td>

More readers interested in JavaScript can check the topics of this site: "Summary of JavaScript Switching Effects and Skills", "Summary of JavaScript Search Algorithm Skills", "Summary of JavaScript Animation Effects and Skills", "Summary of JavaScript Error and Debugging Skills", "Summary of JavaScript Data Structure and Algorithm Skills", "Summary of JavaScript Traversal Algorithms and Skills" and "Summary of JavaScript Mathematical Operation Usage"

I hope this article is helpful to everyone's JavaScript programming.